Electrode assembly and secondary battery having the same

Abstract

An electrode assembly of a secondary battery includes a cathode including a cathode active material layer, an anode including an anode active material layer, and a ceramic coating layer formed on at least one of surfaces of the cathode and anode that face each other. The ceramic coating layer includes a ceramic powder and a binder. The specific surface area of the ceramic powder is more than 1.5 m 2 /g and less than 15.0 m 2 /g, and, in the particle size distribution of the ceramic powder, the D10 value is more than 0.05 μm and the D90 value is less than 3.0 μm.

1. An electrode assembly, comprising:
 a cathode including a cathode active material layer; 
 an anode including an anode active material layer; and 
 a ceramic coating layer formed on at least one of the active material layers of the cathode and anode, the ceramic coating layer including a ceramic powder and a binder, 
 wherein the specific surface area of the ceramic powder is more than 1.5 m 2 /g and less than 15.0 m 2 /g, and 
 wherein the amount of the binder is less than 10 weight % of the total amount of the binder and ceramic powder; 
 and wherein the amount of the ceramic powder is more than 90 weight % of the total amount of the binder and ceramic powder. 
 
     
     
       2. The electrode assembly of  claim 1 , wherein the ceramic coating layer is formed by coating a ceramic paste comprising the ceramic powder, the binder and a solvent onto at least one of the cathode or anode. 
     
     
       3. The electrode assembly of  claim 2 , wherein the viscosity of the ceramic paste is 20 to 3,000 cps. 
     
     
       4. The electrode assembly of  claim 1 , wherein a thickness distribution of the ceramic coating layer is less than 10%. 
     
     
       5. The electrode assembly of  claim 1 , wherein the binder is an acrylate group rubber. 
     
     
       6. The electrode assembly of  claim 1 , further including a polyolefin film separator between the anode and the cathode. 
     
     
       7. The electrode assembly of  claim 1 , wherein the electrode assembly does not have a polyolefin film separator between the anode and the cathode. 
     
     
       8. The electrode assembly of  claim 1 , wherein the electrode assembly is wound in a jelly-roll configuration, and wherein the ceramic coating layer is formed on outer surfaces of the cathode and the anode. 
     
     
       9. The electrode assembly of  claim 1 , wherein the electrode assembly is wound in a jelly-roll configuration, and wherein the ceramic coating layer is formed on inner surfaces of the cathode and the anode. 
     
     
       10. The electrode assembly of  claim 1 , wherein the electrode assembly is wound in a jelly-roll configuration, and wherein the ceramic coating layer is formed on both an inner surface and an outer surface of one of the cathode and the anode. 
     
     
       11. A secondary battery, comprising:
 the electrode assembly according to  claim 1 ; 
 a can that receives the electrode assembly; and 
 a cap assembly that seals the can. 
 
     
     
       12. An electrode assembly, comprising:
 a cathode comprising a cathode active material layer; 
 an anode comprising an anode active material layer; and 
 a ceramic coating layer formed on at least one of the active material layers of the cathode and anode, the ceramic coating layer including ceramic powder and a binder, 
 wherein the particle size distribution of the ceramic powder has a D10 value of more than 0.05 μm and a D90 value of less than 3.0 μm, and 
 wherein the amount of the binder is less than 10 weight % of the total amount of the binder and ceramic powder; 
 and wherein the amount of the ceramic powder is more than 90 weight % of the total amount of the binder and ceramic powder. 
 
     
     
       13. The electrode assembly of  claim 12 , wherein the ceramic coating layer is formed by coating a ceramic paste comprising the ceramic powder, the binder and a solvent onto at least one of the cathode or anode. 
     
     
       14. The electrode assembly of  claim 13 , wherein the viscosity of the ceramic paste is 20 to 3,000 cps. 
     
     
       15. The electrode assembly of  claim 12 , wherein a thickness distribution of the ceramic coating layer is less than 10%. 
     
     
       16. The electrode assembly of  claim 12 , wherein the binder is an acrylate group rubber. 
     
     
       17. A secondary battery, comprising:
 the electrode assembly according to  claim 12 ; 
 a can that receives the electrode assembly; and 
 a cap assembly that seals the can. 
 
     
     
       18. An electrode assembly, comprising:
 a cathode comprising a cathode active material layer; 
 an anode comprising an anode active material layer; and 
 a ceramic coating layer, formed on at least one of the active material layers of the cathode and anode, the ceramic coating layer including a ceramic powder and a binder, 
 wherein the specific surface area of the ceramic powder is more than 1.5 m 2 /g and less than 15.0 m 2/g; and    
 wherein the particle size distribution of the ceramic powder has a D10 value of more than 0.05 μm and a D90 value of less than 3.0 μm, and 
 wherein the amount of the binder is less than 10 weight % of the total amount of the binder and ceramic powder; 
 and wherein the amount of the ceramic powder is more than 90 weight % of the total amount of the binder and ceramic powder. 
 
     
     
       19. A secondary battery, comprising:
 an electrode assembly; 
 a can that receives the electrode assembly; and 
 a cap assembly that seals the can, 
 wherein the electrode assembly comprises:
 a cathode comprising a cathode active material layer, 
 an anode comprising an anode active material layer, and 
 a ceramic coating layer formed on at least one of the active material layers of the cathode and anode, the ceramic coating layer including ceramic powder and a binder, 
 
 wherein the specific surface area of the ceramic powder is more than 1.5 m 2 /g and less than 15.0 m 2 /g; and 
 wherein particle size distribution of the ceramic powder has a D10 value of more than 0.05 μm and a D90 value of less than 3.0 μm, and 
 wherein the amount of the binder is less than 10 weight % of the total amount of the binder and ceramic powder; 
 and wherein the amount of the ceramic powder is more than 90 weight % of the total amount of the binder and ceramic powder.